Umbrella hub system



FIG. 1 is a perspective view of an umbrella hub system;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, with the left side being a mirror image thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a bottom perspective view of the top hub of the umbrella hub system, shown separate for ease of disclosure;

FIG. 8 is a top perspective view thereof;

FIG. 9 is a front view thereof, with the rear, right, and left sides being a mirror image thereof;

FIG. 10 is a top view thereof;

FIG. 11 is a bottom view thereof;

FIG. 12 is another perspective view of the top hub of the umbrella hub system, shown in use with environment;

FIG. 13 is a top perspective view of the bottom hub of the umbrella hub system, shown separate for ease of disclosure;

FIG. 14 is a front view thereof;

FIG. 15 is a right side view thereof, with the left side view being a mirror image thereof;

FIG. 16 is a rear view thereof;

FIG. 17 is a top view thereof;

FIG. 18 is a bottom view thereof; and,

FIG. 19 is another perspective view of the bottom hub of the umbrella hub system, shown in use with environment.

The broken lines depict portions of the article and environment that form no part of the claimed design. 

CLAIM The ornamental design for an umbrella hub system, as shown and described. 